[Freeswitch-users] Freeswitch drops calls after 32 seconds

David Horton daveh at drachtio.org
Tue Apr 7 02:13:35 UTC 2020 

Call drops after 32s are almost always caused by an ACK timeout.  Given the retransmits shown in your listing where freeswitch is resending the 200 OK and the client is resending the ACK, this does appear to be the problem.  Either the ACK is not reaching freeswitch or (more likely) it is not being matched to the the 200 OK response.  Hard to say more without seeing the actual messages.

Dave

On Apr 3, 2020, at 9:11 AM, MikeKulls <freeswitch at mikesdriveway.com> wrote:

I've installed freeswitch on a Raspberry PI 3 with pretty much bog stock config. The only change I've done is to delete the ipv6 profiles and changed the default password. I've connected a few different clients, 3 soft phones and 2 ATAs. When making calls with some of the clients the calls are dropped after 32 seconds. For other clients the calls will proceed for half an hour no issues. I have absolutely no complexity here, it's all internal phones on the local /24 lan. There are no firewalls, traffic only goes via a switch. I have no external SIP gateway, none of the clients are behind a NAT. I've done extensive googling and everything I find talks about NAT issues and VPNs, multiple subnets etc. I'm not running any of that. Packet capture and more details below.


Some of the things I've tried

- complete OS and freeswitch reinstall on the PI

- disable IPv6 on the PI (made a big improvement, now the remote phone rings instantly instead of long delay)

- full OS update before installing freeswitch

- tried clients with both UDP and TCP

- install freeswitch on CentOS 7.

- Disable SIP ALG on router (traffic not going through router anyway)

- Tried all devices on a different network switch

- Tried client options like "use rport" etc




What works:

- Cisco SPA3102 ATA

- Voiper latest version on Windows


What doesn't work

- Latest Voiper on android

- Older version of voiper on windows

- Billion 7404VGP

- Android version of Voip by antisip



TShark capture of a call dropping. IPs are:

192.168.1.245 Freeswitch

192.168.1.225 Windows PC with older copy of voiper

192.168.1.202 Cisco ATA


    1 0.000000000 192.168.1.225 â 192.168.1.245 SIP/SDP 1038 Request: INVITE sip:1004 at 192.168.1.245;transport=UDP |
    2 0.005573031 192.168.1.245 â 192.168.1.225 SIP 917 Status: 407 Proxy Authentication Required |
    3 0.011167520 192.168.1.225 â 192.168.1.245 SIP 408 Request: ACK sip:1004 at 192.168.1.245;transport=UDP |
    4 0.016217586 192.168.1.225 â 192.168.1.245 SIP/SDP 1314 Request: INVITE sip:1004 at 192.168.1.245;transport=UDP |
    5 0.037157271 192.168.1.245 â 192.168.1.225 SIP 413 Status: 100 Trying |
    6 0.094830064 192.168.1.245 â 192.168.1.202 SIP/SDP 1283 Request: INVITE sip:1004 at 192.168.1.202:5083;transport=tcp |
    7 0.115792718 192.168.1.202 â 192.168.1.245 SIP 365 Status: 100 Trying |
    8 0.115932040 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 [ACK] Seq=1230 Ack=312 Win=63784 Len=0
    9 0.124784941 192.168.1.202 â 192.168.1.245 SIP 526 Status: 180 Ringing |
   10 0.124863118 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 [ACK] Seq=1230 Ack=784 Win=63784 Len=0
   11 0.151217241 192.168.1.245 â 192.168.1.225 SIP/SDP 1205 Status: 183 Session Progress |
   12 2.263254019 192.168.1.202 â 192.168.1.245 SIP/SDP 901 Status: 200 OK |
   13 2.263406934 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 [ACK] Seq=1230 Ack=1631 Win=63784 Len=0
   14 2.272446033 192.168.1.245 â 192.168.1.202 SIP 471 Request: ACK sip:1004 at 192.168.1.202:5083;transport=tcp |
   15 2.284211777 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   16 2.469876726 192.168.1.202 â 192.168.1.245 TCP 60 5083 â 5060 [ACK] Seq=1631 Ack=1647 Win=16000 Len=0
   17 2.784653094 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   18 3.785916037 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   19 5.787085997 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   20 8.903231371 192.168.1.245 â 192.168.1.225 TCP 54 5060 â 56460 [ACK] Seq=1 Ack=1 Win=501 Len=0
   21 8.903781836 192.168.1.225 â 192.168.1.245 TCP 60 [TCP ACKed unseen segment] 56460 â 5060 [ACK] Seq=1 Ack=2 Win=8212 Len=0
   22 9.788128841 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   23 13.788284085 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   24 17.788442453 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   25 20.361180947 192.168.1.225 â 192.168.1.245 UDP 60 5060 â 5060 Len=4
   26 21.788537538 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   27 25.788690954 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   28 29.789847278 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   29 32.583226442 192.168.1.245 â 192.168.1.202 TCP 54 [TCP Keep-Alive] 5060 â 5083 [ACK] Seq=1646 Ack=1631 Win=63784 Len=0
   30 32.584076227 192.168.1.202 â 192.168.1.245 TCP 60 [TCP Keep-Alive ACK] 5083 â 5060 [ACK] Seq=1631 Ack=1647 Win=16000 Len=0
   31 33.790019961 192.168.1.245 â 192.168.1.225 SIP/SDP 1169 Status: 200 OK |
   32 34.284637050 192.168.1.245 â 192.168.1.225 SIP 704 Request: BYE sip:1002 at 192.168.1.225:5060;transport=UDP |
   33 34.327728390 192.168.1.245 â 192.168.1.202 SIP 672 Request: BYE sip:1004 at 192.168.1.202:5083;transport=tcp |
   34 34.344437951 192.168.1.202 â 192.168.1.245 SIP 381 Status: 200 OK |
   35 34.393228415 192.168.1.245 â 192.168.1.202 TCP 54 5060 â 5083 [ACK] Seq=2265 Ack=1958 Win=63784 Len=0
   36 34.422931003 192.168.1.225 â 192.168.1.245 SIP 466 Status: 200 OK |
   37 38.352414375 192.168.1.225 â 192.168.1.245 TCP 60 [TCP ACKed unseen segment] 56460 â 5060 [PSH, ACK] Seq=1 Ack=2 Win=8212 Len=4
   38 38.352610259 192.168.1.245 â 192.168.1.225 TCP 56 [TCP Previous segment not captured] 5060 â 56460 [PSH, ACK] Seq=2 Ack=5 Win=501 Len=2
   39 38.393526512 192.168.1.225 â 192.168.1.245 TCP 60 [TCP ACKed unseen segment] 56460 â 5060 [ACK] Seq=5 Ack=4 Win=8212 Len=0

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